A050597 Numbers n such that 143*2^n-1 is prime.

2, 4, 6, 8, 12, 18, 26, 32, 34, 36, 42, 60, 78, 82, 84, 88, 154, 174, 208, 256, 366, 448, 478, 746, 1178, 1290, 2284, 3606, 35706, 36920, 45882, 47308, 70932, 96278, 111886, 144736, 303284, 374626

Offset

1,1

Links

Table of n, a(n) for n=1..38.

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300

Wilfrid Keller, List of primes k.2^n - 1 for k < 300

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

Kosmaj, Riesel list k<300.

Prog

(PARI) is(n)=ispseudoprime(143*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A330813 A015897 A240211 * A288603 A324939 A057335

Adjacent sequences: A050594 A050595 A050596 * A050598 A050599 A050600

Keyword

hard,nonn

Author

N. J. A. Sloane, Dec 29 1999

Extensions

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008

Status

approved